diff --git a/netboot.sh b/netboot.sh
index f16baa1..d9d4e97 100644
--- a/netboot.sh
+++ b/netboot.sh
@@ -363,7 +363,7 @@ d-i partman-lvm/confirm_nooverwrite boolean true
 EOF
 
     if [ "$DEBI_PART" = "regular" ]; then
-        $save_preseed <<"EOF"
+        $save_preseed <<'EOF'
 d-i partman/default_filesystem string $DEBI_FS
 d-i partman-auto/expert_recipe string naive :: 0 1 -1 $default_filesystem $primary{ } $bootable{ } method{ format } format{ } use_filesystem{ } $default_filesystem{ } mountpoint{ / } .
 d-i partman-auto/choose_recipe select naive